btrfs: unify extent_page_data type passed as void

Functions called from extent_write_cache_pages used void* as generic
callback data, but all of them convert it to extent_page_data, or use it
directly.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0ceb427..eee9cc5 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -138,7 +138,7 @@ static void add_extent_changeset(struct extent_state *state, unsigned bits,
        BUG_ON(ret < 0);
 }
 
-static void flush_write_bio(void *data);
+static void flush_write_bio(struct extent_page_data *epd);
 
 static inline struct btrfs_fs_info *
 tree_fs_info(struct extent_io_tree *tree)
@@ -3456,10 +3456,9 @@ done:
  * and the end_io handler clears the writeback ranges
  */
 static int __extent_writepage(struct page *page, struct writeback_control *wbc,
-                             void *data)
+                             struct extent_page_data *epd)
 {
        struct inode *inode = page->mapping->host;
-       struct extent_page_data *epd = data;
        u64 start = page_offset(page);
        u64 page_end = start + PAGE_SIZE - 1;
        int ret;
@@ -3905,7 +3904,7 @@ retry:
  */
 static int extent_write_cache_pages(struct address_space *mapping,
                             struct writeback_control *wbc,
-                            void *data)
+                            struct extent_page_data *epd)
 {
        struct inode *inode = mapping->host;
        int ret = 0;
@@ -3969,7 +3968,7 @@ retry:
                         * mapping
                         */
                        if (!trylock_page(page)) {
-                               flush_write_bio(data);
+                               flush_write_bio(epd);
                                lock_page(page);
                        }
 
@@ -3980,7 +3979,7 @@ retry:
 
                        if (wbc->sync_mode != WB_SYNC_NONE) {
                                if (PageWriteback(page))
-                                       flush_write_bio(data);
+                                       flush_write_bio(epd);
                                wait_on_page_writeback(page);
                        }
 
@@ -3990,7 +3989,7 @@ retry:
                                continue;
                        }
 
-                       ret = __extent_writepage(page, wbc, data);
+                       ret = __extent_writepage(page, wbc, epd);
 
                        if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) {
                                unlock_page(page);
@@ -4038,10 +4037,8 @@ retry:
        return ret;
 }
 
-static void flush_write_bio(void *data)
+static void flush_write_bio(struct extent_page_data *epd)
 {
-       struct extent_page_data *epd = data;
-
        if (epd->bio) {
                int ret;